Vehicle jack



Jan. 28, 1936. H. J. MARLOWE VEHICLE JACK Original Filed July 22, 1951 2Sheets-Sheet l (f Yin-W705 ATJ'JAME Jmzs, 193s. H O E 1,029,179

VEHICLE JACK Original Filed July 22, 1931 2 Sheets-Sheet 2 /8 v l/I111 m36 H IIII I Patented Jan. 28, 1936 UNITED STATES PATENT OFFICIE VEHICLEJACK Harold J. Marlowe, Brooklyn, N. Y., assignor to JackomaticCorporation, a corporation of Delaware 13 Claims.

' automobile is raised. Whereas, in collapsed condition, the device ishidden behind the axle of the automobile to be practically completelyhidden from view.

It is also an object of the invention to provide a lifting device whichis constructed in lazy-tong formation with the upper end of one of thetopmost links being held against rectilinear movement, while to theupper end of the companion link a horizontal force is applied, wherebyre- 2o spectively expansion and collapse of the lifting device iseffected.

It is a further object of the invention to provide means for causingautomatic collapse of the device when the maintaining of the automobile25 in expanded condition is no longer desired.

A further object of the invention includes a convenient means forsecuring the lifting device to the axle of an automobile.

Other and equally important objects will be- 80 come apparent from aperusal of the invention which comprises the means described in thefollowing specification, particularly pointed out in the claims forminga part thereof, and illustrated in the accompanying drawings, in which35 Fig. 1 is a side view of an automobile to which my invention has beenapplied.

Fig. 2 is a fragmentary top plan view showing an operating cylinder andthe jack in idle position.

Fig. 3 is a section on the line 3-3 of Fig. 2.

40 Fig. 4 is an end view of the part shown in Fig. 3.

Fig.5 is a section on the line 5-5 of Fig. 3; and

Fig. 6 is a longitudinal section through the operating cylinder for thejack.

Referring to the drawings, it will be apparent 45 that a jack isprovided at each end of the automobile, there being a jack provided atthe front axle l0 and another jack secured to the differential casing ofthe automobile or to the torque tube ii. Inasmuch as the two jacks areof identical 50 construction, the description of one will suflice.

As shown in Figs. 2 to 6, the axle Ill is provided with a bracket I 2secured to the axle ill in any approved or convenient manner, and tothis bracket is secured an inverted trough or U-shaped 55 member l3which contains the jack in collapsed condition, and which also hassecured thereto a cylinder I4 whose piston serves for the actuation ofthe jack. The cylinder I4 is substantially in co-axial relation to saidtrough.

As shown in Fig. 6, the cylinder I4 is formed with an extension l5 whichis formed with a chamber l6 and a bore l1, into which is screwed afitting I8 for a pipe is conveying oil under pressure to the cylinderfrom a pump (not shown) contained in the operating unit secured to thecowl board 2! as shown in Fig. l.

The cylinder surrounds a movable cylinder 22 which projects at the rightend, as viewed in Fig. 6, through a packing gland 23 and is providedwith a head 24.

A spring 25 connects the cylinder head with the bottom of the stationarycylinder I4, so that after expansion of the spring by reason of anoutward movement of the cylinder 22, the latter is retracted into normalposition by the contraction of the spring 25.

To the head 24 are secured links 26, there being a roller 21 at thepivotal connection between the cylinder head 24 and the links 26 whichmoves upon the expulsion of the cylinder 22 on the top part of thetrough I3. 7

Intermediate the links 26'are pivotally secured links 28, whose upperend is articulated to the trough member l3 as at 28', there beingsprings 29 provided at the pivotal connection of said links, so thatthese links operate as lazy-tongs. To the links 28 are pivotallyconnected links 30, and to the links 26 links 3i are pivotallyconnected, there being springs 32 and 33, respectively, at the pivotalconnection of links 28 and 32 and 26 and 3|, respectively. The links and3| are pivotally connected with a shoe 34.

In Fig. 3, the jack is shown in collapsed condition in full lines, andin expanded condition in dotted lines.

The operation of the device is as follows:

Upon oil being forced into the cylinder, the ram 22 is forced outwardlyagainst the tension of the spring 25, causing the roller 21 to travel onthe cross member of the trough l3, whereby the lazytong is expanded andthe shoe 34 brought in contact with the ground. The continued expansioncauses lifting of the vehicle.

To collapse thejack, oil is permitted to escape from the cylinder [4whereupon the various springs of the jack aided by the compression ofthe spring 25 force the links upwardly, which normally are received inthe trough and but slightly protrude from the trough.

The operating unit 20 has a control shaft 35 connected bye universaljoint 36 to a iccl; 5'1 (Fig. 1) provided at the dash board 33. Theturning of the lock causes oil to flow through the pipe [9 to the frontjack or through a pipe 40 "to the rear jack for actuation of therespective operating cylinder to cause expansion of the jacks wheneither the front or the rear of the vehicle is to be raised.

Whiie the drawings disclose a preferred embodi-' ment of the invention,the same are merely ii lustrated by way of explanation and not by way oflimitation. Numerous changes, alterations, and revisions may be madewithin the purview of the invention.

1, therefore, do not wish to limit myself to the details of constructionor arrangement of parts, as shown, but claim my invention as broadly asthe state of the art permits.

I claim:

1. A hydraulically operated lifting jack, in-

' cluding in combination, an inverted trough member having an uppercross plate, a jack unit comprising a plurality of links connected inlazy-tong formation, the upper end of one of the topmost links beingpivotally secured te said trough, and

means including a pressure cylinder secured in alinement with saidtrough, and a reciprocable piston arranged in the cylinder for movingthe upper end of the other topmost link on the upper cross plate of saidtrough.

2. A hydrauiically operated lifting jack, including in combination, aninverted trough adapted to be secured adjacent the underside of avehicle, said trough having an upper cross. plate, a jack unitcomprising a plurality of links connected in lazy-tong formation, theupper end of one of the topmost links being pivotally secured to saidtrough, means for moving the upper end of the other topmost link on thecross plate of said trough and including a pressure cylinder arrangedadjacent the end of said trough and in alinement therewith, andareciprocable piston arranged in the cylinder, said jack unit, when incollapsed condition, resting at least partially within the trough andforming a compact unit with the pressure cylinder. 7

3. A hydraulically operated iifting jack, including in combination, aninverted trough adapted to be secured adjacent the underside of avehicle, a jack unit comprising a plurality of links connected inlazy-tong formation, the upper end of one of the topmost links beingpivotaiiy secured to said trough, a pressure cylinder secured in saidtrough, and a reciprocating piston in said cylinder connected with theupper end of the traveiing on the cross member of said trough.

5. A jack unit for permanent association with the axle of a vehicleincluding,.in combination, a supporting member having an upperhorizontal bearing plate, a jack comprising-a plurality of linksconnected together in lazy-tong formation, the upper end of one of thetopmost iinks being pivotally secured to said supporting member belowthe plate, an anti-friction element mounted at the upper end of theother of the topmost links and adapted to bear against the bearingplate, a pressure cylinder secured to said supporting member, andareciprocable piston arranged in the cylinder and having one end thereofconnected at the upper end of the link carrying the anti-frictionelement, said jack when in its collapsed condition resting insubstantial horizontal alinement with the cylinder and forming a compactunit therewith.

6. A jack for motor vehicles ccmprising, in combination, a bracketadapted to be secured to a vehicle body closely adiacent the undersidethereof and providing an elongated downwardlyfacing horizontal bearingsurface, a lazy-tong linkage having two upper links pivoted intermediate their ends and two lower links each pivotally 1 connected at oneend to the lower end of one of the upper links, a foot plate supportedat the lower ends of the lower links, one of said upper,

links being pivoted at its upper end to said bracket, a roller mountedon the upper end of the other upper link and bearing against saidbearing surface, piston means disposed horizontally at one side edge ofthe linkage operable positively to move said roller along saidhorizontal bearing surface in one direction to efiect a downwardextension of the linkage and impositively to move said roller to retractsaid Iinkage and springs supplemental to said piston means actingbetween the links at each of the pivotal connections therebetween urgingthe same to collapsed position to insure complete retraction and to holdthe same firmly in retracted pesition.

'7. A jack for motor vehicles comprising, in combination, a bracketadapted to ire secured to a vehicle body closely adjacent the undersidethereof and providing a horizontally disposed elongateddownwardly-facing bearing surface, a lazy-tong linkage having two upperiinks and two lower links, one of said upper links being pivoted at itsupper end to said braoket for pivotal movement about a fixed axis, aroller mounted on the upper end of the other one of said upper links andbearing against said bearing surface, means depending from said bracketforming a horizontal guide for saidroller, a foot plate pivotallysupported at the lower ends of said lower links, a

cylinder supported in horizontal position immediately below said bracketparallel with and at end of one of said upper links and operablepositively to move the same along said bearing surface in one directionto efl'ect a downward extension of the linkage, a tension springconeealed within said cylinder operable to move said roller in theopposite direction to effect a retraction of said linkage, and auxiliaryspring means acting between the links aiding to retract the linkage andto retain the same compactly folded so as to require a minimum of space.

8. A hydraulicallyoperated jack-adapted .for permanent mounting on avehicle adjacent the underside thereof, including in combination, anextendible and retractable lazy-tong jack unit, cylinder and pistonoperating mechanism for the jack unit, and a common supporting memberfor the jack unit and the cylinder and piston mechanism, theconnectlc-ns between the jack unit and the supporting member being suchthat all vertical components of thrust are transmitted from the jackunit tothe vehicle through the supporting member without affecting thecylinder and piston mechanism.

9. A hydraulically operated jack for permanent mounting on a vehicleadjacent the underside thereof, including in combination, a supportingmember, an extendible and retractable jack unit comprising a pluralityof links connected together in lazy-tong formation, the upper end of oneof the topmost links being pivotally connected to said supportingmember, the upper end of the other of the topmost links being likewiseconnected to the supporting member but arranged for longitudinalmovement therealong, said connections being such that all verticalcomponents of thrust exerted during the operation of the jack aretransmitted directly from the jack to thesupporting member, and acylinder and piston mechanism carried by said supporting member foroperating the lazy-tong jack unit.

10. A hydraulically operated jack adapted for permanent mounting on avehicle adjacent the underside thereof, including in combination, asupporting member, an extendible and retractable iack unit, comprising aplurality of links connected together'in lazy-tong formation, the upperend of one of the topmost links being pivotally secured to saidsupporting member, the upper end of the other of the topmost links beingmovable, a pressure cylinder secured to said supporting member, and areciprocable piston arranged in the cylinder and having one end thereofconnected to the movable end of the second mentioned upper link, saidjack unit when in its retracted position resting in substantialhorizontal alinement with said cylinder and forming a compact unittherewith.

11. A hydraulically operated jack for permanent mounting on a vehicleadjacent the underside thereof, including in combination, a supportingmember, an extendible and retractable jack unit comprising a pluralityof links connected together in lazy-tong formation, the upper end of oneof the topmost links being pivotally secured to said supporting member,an anti-friction element mounted at the upper end of the other of thetopmost links and arranged to bear on the supporting member, a pressurecylinder secured to said supporting member, and a reciprocable pistonarranged in the cylnder and having one end thereof connected at theupper end of .the link carrying the anti-friction element, said jackwhen in its retracted position resting in substantial horizontalalinement with the cyiinder and forming a compact unit therewith.

12. A hydraulically operated Jack for permanent mounting on a vehicleadjacent the underside thereof, including in combination, a U- shapedsupporting member, an extendible and partially in the supporting memberin substantial horizontal alinement with the cylinder and forming acompact unit therewith.

13. A hydraulically operated jack adapted for permanent mounting on avehicle adjacent the underside thereof, including in combination, a

supporting member, an extendible and retract-.

able jack unit, comprising a plurality of links pivotally connectedtogether in lazy-tong formation, the upper end of one of the topmostlinks being pivotally secured to said supporting member, the upper endof the other of the topmost links being movable along the supportingmember and provided with bearing means resting thereon, a pressurecylinder secured to said supporting member, a reciprocable pistonarranged in the cylinder and having one end thereof connected at theupper movable end of the Jack unit, said piston being adapted when movedin one direction to eflect the extension of the lack unit to operativeposition, and spring means arranged at the pivotal connections of thelazytong linkage to eifect the retraction of the jack to inoperativeposition, said Jack unit when in its retracted position resting insubstantial horizontal alinement with said cylinder and forming acompact unit therewith.

HAROLD J. MARLOWE.

